1 /***************************************************************************/
2
3 /*
4 * linux/arch/m68knommu/platform/54xx/config.c
5 *
6 * Copyright (C) 2010, Philippe De Muyter <phdm@macqel.be>
7 */
8
9 /***************************************************************************/
10
11 #include <linux/kernel.h>
12 #include <linux/param.h>
13 #include <linux/init.h>
14 #include <linux/interrupt.h>
15 #include <linux/io.h>
16 #include <linux/mm.h>
17 #include <linux/bootmem.h>
18 #include <asm/pgalloc.h>
19 #include <asm/machdep.h>
20 #include <asm/coldfire.h>
21 #include <asm/m54xxsim.h>
22 #include <asm/mcfuart.h>
23 #include <asm/m54xxgpt.h>
24 #ifdef CONFIG_MMU
25 #include <asm/mmu_context.h>
26 #endif
27
28 /***************************************************************************/
29
m54xx_uarts_init(void)30 static void __init m54xx_uarts_init(void)
31 {
32 /* enable io pins */
33 __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD,
34 MCF_MBAR + MCF_PAR_PSC(0));
35 __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD | MCF_PAR_PSC_RTS_RTS,
36 MCF_MBAR + MCF_PAR_PSC(1));
37 __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD | MCF_PAR_PSC_RTS_RTS |
38 MCF_PAR_PSC_CTS_CTS, MCF_MBAR + MCF_PAR_PSC(2));
39 __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD,
40 MCF_MBAR + MCF_PAR_PSC(3));
41 }
42
43 /***************************************************************************/
44
mcf54xx_reset(void)45 static void mcf54xx_reset(void)
46 {
47 /* disable interrupts and enable the watchdog */
48 asm("movew #0x2700, %sr\n");
49 __raw_writel(0, MCF_MBAR + MCF_GPT_GMS0);
50 __raw_writel(MCF_GPT_GCIR_CNT(1), MCF_MBAR + MCF_GPT_GCIR0);
51 __raw_writel(MCF_GPT_GMS_WDEN | MCF_GPT_GMS_CE | MCF_GPT_GMS_TMS(4),
52 MCF_MBAR + MCF_GPT_GMS0);
53 }
54
55 /***************************************************************************/
56
57 #ifdef CONFIG_MMU
58
59 unsigned long num_pages;
60
mcf54xx_bootmem_alloc(void)61 static void __init mcf54xx_bootmem_alloc(void)
62 {
63 unsigned long start_pfn;
64 unsigned long memstart;
65
66 /* _rambase and _ramend will be naturally page aligned */
67 m68k_memory[0].addr = _rambase;
68 m68k_memory[0].size = _ramend - _rambase;
69
70 /* compute total pages in system */
71 num_pages = (_ramend - _rambase) >> PAGE_SHIFT;
72
73 /* page numbers */
74 memstart = PAGE_ALIGN(_ramstart);
75 min_low_pfn = _rambase >> PAGE_SHIFT;
76 start_pfn = memstart >> PAGE_SHIFT;
77 max_low_pfn = _ramend >> PAGE_SHIFT;
78 high_memory = (void *)_ramend;
79
80 m68k_virt_to_node_shift = fls(_ramend - _rambase - 1) - 6;
81 module_fixup(NULL, __start_fixup, __stop_fixup);
82
83 /* setup bootmem data */
84 m68k_setup_node(0);
85 memstart += init_bootmem_node(NODE_DATA(0), start_pfn,
86 min_low_pfn, max_low_pfn);
87 free_bootmem_node(NODE_DATA(0), memstart, _ramend - memstart);
88 }
89
90 #endif /* CONFIG_MMU */
91
92 /***************************************************************************/
93
config_BSP(char * commandp,int size)94 void __init config_BSP(char *commandp, int size)
95 {
96 #ifdef CONFIG_MMU
97 mcf54xx_bootmem_alloc();
98 mmu_context_init();
99 #endif
100 mach_reset = mcf54xx_reset;
101 mach_sched_init = hw_timer_init;
102 m54xx_uarts_init();
103 }
104
105 /***************************************************************************/
106